NAME RESOLUTION DEVICE, NAME RESOLUTION SYSTEM, NAME RESOLUTION METHOD, AND NAME RESOLUTION PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a name resolution device, name resolution system, name resolution method, and name resolution program that can immediately detect an update of the in-zone state of a client from the outside of a mobile communication system and answer an IP address of an appropriate edge server.SOLUTION: A name resolution device 5 includes: a transmission source conversion unit 52 for receiving a change notice of an in-zone state including correspondence relation between information identifying a client 1 and an ECGI extracted from a control signal in a mobile communication system; an in-zone state DB 521 for storing the latest in-zone state of the client 1 on the basis of the change notice; and a query processing unit 53 for answering an address associated with the ECGI on the basis of the in-zone state of the client 1, i.e. a transmission source of a DNS query.SELECTED DRAWING: Figure 4